Bloodline 10.5″ 300 Blackout

This Rosco 10.5” 300 Blackout barrel was designed for SBR and Pistol use in conjunction with suppressors. The 10.5” 300 Blackout Rosco barrel was made to be a direct replacement for any MK 18 platforms that are currently in 5.56 NATO. The 10.5” barrel is also perfect for carbines which require a slightly longer rail in order to run PEQ-15’s, D-BAL (series), or any laser aiming devices comfortably. ALL NFA RULES APPLY!

Description

This Rosco 10.5” 300 Blackout (300 BLK) barrel was designed for SBR and Pistol use in conjunction with suppressors. The 10.5” 300 Blackout Rosco barrel was made to be a direct replacement for any MK 18 platforms that are currently in 5.56 NATO. The 10.5” barrel is also perfect for carbines which require a slightly longer rail in order to run PEQ-15’s, D-BAL (series), or any laser aiming devices comfortably. ALL NFA RULES APPLY!

Our Rosco 300 Blackout barrels were created by using input from SOCOM end users and some of the original creators of this caliber. Every barrel was designed to optimize the original role for the 300 Blackout; to be suppressor friendly and accurate. It is our goal to get you the performance that you seek out of these AR15 barrels when running sub-sonic ammo or supersonic ammo (depending on barrel length). Twist rates, gas port diameters, and lengths have all been taken into account when we set out to make these. Let’s just say that we don’t like leaving things to chance.

Additional information

Weight

2 lbs

Dimensions

19.5 × 2.3 × 2.2 in

9 reviews for Bloodline 10.5″ 300 Blackout

Rated 5 out of 5

Spencer5169 (verified owner)–March 21, 2018

This is one of the best 10.5 300 Blackout barrels I have owned. You will be able to tell the difference in quality compared to many other barrels and it’s at a great price. Also, their customer service is top notch. Never have I had people work so fast and diligently to fix a shipping issue. Professional, friendly and damn good barrels. What more could you ask for?

Rated 5 out of 5

Chris English –May 19, 2018

This was the only barrel my local shop had in stock. I’ve never heard of Rosco.. Boy am I glad they had it! Sub MOA .792” at 100 yards with a 3 shot group! Don’t hesitate to purchase this barrel.. Supreme quality and function.. I’m very impressed!! I wish I could upload the target pic…

Rated 5 out of 5

Mac –August 2, 2018

Asked my local shop to build an 300 Blk Pistol for me. Asked for a 10.5 inch barrel, as I felt it would give me a little more velocity for the supers. Have a 300 Blk Rifle and wanted something to put a can on. After shooting it, I was impressed with the accuracy, so I looked through the handguard and saw Rosco. Web search on Rosco was outstanding. My 110 and 125 Sierras, touch at 50 yards, with a red dot, When I do my part. When they don’t, I know it’s me. As ACC says 300 Blk is best with a 9 “, I added 1.5 inches as a Fudge. Thanked my gunsmith for his excellent choice in the ROSCO barrel selection and the quality of the overall Aero Precision Build.

Rated 5 out of 5

Bubba (verified owner)–April 9, 2019

Order the 10.5 barrel for a 300 blackout built received it in good time put 100 rounds though it at 50yrds some were on top of each other with a Red dot barrel works good won’t break the bank and looks good with the areo upper.

Rated 5 out of 5

Jesus Nunez (verified owner)–September 20, 2019

Even though this item was noted as backorder I still recieved it in good time. The barrel looks solid and top notch. I am still yet to put some rounds through it but once I do you’ll hear about it.

Rated 5 out of 5

Levi Gibbs –September 28, 2019

Ordered one of these a while back for my first suppressed 300 blk build and it’s done a better job than I could asked for! A couple thousand rounds later and I can attest, these truly are the best barrel at this price point and I’d say even better than some more expensive brands. If you’re on the fence about buying one, go ahead and do it, you won’t regret it!

Rated 5 out of 5

Christopher (verified owner)–October 15, 2019

The only barrel I’ll ever go with is a rosco. Easily the best barrels on the market.

Rated 5 out of 5

Devin Cook (verified owner)–January 13, 2020

Great barrel for a good price I got the bloodline 10.5 in .300 blackout. 1000 rounds threw so far and no complaints. I will be buying more for future builds

Rated 5 out of 5

Aaron (verified owner)–April 27, 2020

Sent sky lead through this 10.5 300 blackout barrel recently. It shoots so smoothly. Running it with a direct thread silencerco omega 9k. Its very quiet. I was running a 8 inch barrel before but the 10.5 is smoother and quieter. Also I was running a standard buffer spring and h1 buffer. It was throwing brass at my 3 oclock might throw in a odin works adjustable buffer to tune it. I highly recommend this barrel if you are looking at getting a 300 blackout build going